¹Bernard, Walter. "Grianan of Aileach." Proceedings of the Royal Irish Academy 15 (1879): 415.

²Bernard.

³Grianan of Aileach." Megalithic Ireland. Web. 19 Mar. 2011. <http://www.megalithicireland.com/Grianan of Aileach.html>.

⁴"Grianan of Aileach - Ringfort - County Donegal." Stone Circles and Megalithic Monuments in the British Isles and Ireland - Megalithics. Web. 19 Mar. 2011. <http://www.megalithics.com/ireland/grianan/granmain.htm>.

⁵Maghtochair. Inishowen: Its History, Traditions,& Antiquities Containing a Number of Original Documents,with Numerous Notes from the Annals of the Four Masters,and Other Sources. Londonderry: Journal Office, 1867. 17-20.

⁶O'Curry, Eugene. On the Manners and Customs of the Ancient Irish. Vol. 3. New York: Lemma Pub., 1971. 8-9.

⁷The Annals of the Four Masters were compiled between 1632 and 1636 at the Franciscan monastery in the town of Donegal. Entries date from the biblical flood, ( 2,242 years after creation) to 1616 CE.

⁸Macalister, R. A. S. "Pre-Celtic Ireland." The Irish Monthly, 46.540 (June, 1918): 330-31.

⁹According to the Historic Environment Viewer, "During field survey in the 1980’s, a hint of a curving bank and a low mound of broken stones, possibly vestigial remains of the cairn, were noted SE of the cashel entrance, midway between the inner and middle enclosing banks, more or less at the location shown on the 1837 map. This area is now largely heather covered and no remains are visible."

¹⁰The Grianan of Aileach.. 17 June 2010. Information sign at the site. Burt.

¹¹Grianan of Aileach." Megalithic Ireland.

¹²Lacey, Brian. "The Grianán of Aileach: A Note on Its Identification." The Journal of the Royal Society of Antiquaries of Ireland 131 (2001): 148.

¹³The Grianan of Aileach. 17 June 2010.

¹⁴"St. Patrick's Well, Carrowreagh, Donegal." The Northern Antiquarian. 11 Nov. 2009. Web. 20 Mar. 2011. <http://megalithix.wordpress.com/2009/11/11/st-patricks-well-donegal/>.

¹⁵The Grianan of Aileach. 13 July 1979. Information sign at the site. Burt.

¹⁶Cormacan, John O'Donovan, and Robert Payne. The Circuit of Ireland, by Muircheartach MacNeill, Prince of Aileach; a Poem, Written in the Year DCCCCXLII. Dublin: Irish Archaeological Society, 1841. 25

¹⁷Harbison, Peter. Guide to National and Historic Monuments of Ireland: including a Selection of Other Monuments Not in State Care. Dublin: Gill and Macmillan, 1992. 101.

¹⁸Bernard 417.

Note: the two illustrations in the web gallery were taken from The Book of Inishowen; the "St. Columb's Stone" from p. 9, and the "Grianan Plan" from p. 88.
Swan, Harry Percival., and William J. O'Doherty. The Book of Inishowen; a Guide Book and Conspectus of Information Relating to the Barony of Inishowen, County Donegal. Buncrana, Co. Donegal: W. Doherty & Co., 1938.
The Belmont House School has a web page with more information about St. Columb's Stone.